Metal Expand Screws Plastic Expand Screw Our entire range of fasteners are made of carbon steel, alloy&stainless steel, aluminum, brass, and other special materials. Production is carried out in compliance with DIN, IFI, ANSI/ASME, BS, ISO, JIS specifications Packing: G. W.:25Kgs/Carton In Wooden Package or Small Mail Box According to Customer Inquire Surface treatment: Plain, black, zinc, hot dip galvanized, dacromat, elctro galvanized etc.